Cardamine impatiens L. and Sibara virginica (L.) Rollins have little in common save being weedy annuals of the Brassicaceae tribe Arabideae. Cardamine impatiens is erect, to eight dm, with linear siliques and wingless seeds. It grows in shaded, alluvial habitats and blooms and fruits from mid-May to mid-June. Sibara virginica has a spreading habit, seldom above two dm in height, and has flattened siliques with winged seeds. It is found in moist, sunny openings and blooms and fruits from mid-April to mid-May. Cardamine impatiens is of European origin and is established over much of the northeastern United States from New Hampshire west to Michigan and south to West Virginia (Al-Shehbaz 1988). Sibara virginica is indigenous to the southeastern United States and ranges from Florida to Texas north to Virginia, Ohio and Kansas, with disjunct populations in California and Baja California (Weishaupt 1971, Al-Shehbaz 1988).